145 lines
4.5 KiB
C
145 lines
4.5 KiB
C
/* socket.c
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BSD raw socket interface code... */
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/* XXX
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It's not clear how this should work, and that lack of clarity is
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terribly detrimental to the NetBSD 1.1 kernel - it crashes and
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burns.
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Using raw sockets ought to be a big win over using BPF or something
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like it, because you don't need to deal with the complexities of
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the physical layer, but it appears not to be possible with existing
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raw socket implementations. This may be worth revisiting in the
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future. For now, this code can probably be considered a curiosity.
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Sigh. */
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/*
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* Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
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* Copyright (c) 1995-2003 by Internet Software Consortium
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
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* OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* Internet Systems Consortium, Inc.
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* 950 Charter Street
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* Redwood City, CA 94063
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* <info@isc.org>
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* http://www.isc.org/
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*
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* This software has been written for Internet Systems Consortium
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* by Ted Lemon in cooperation with Vixie Enterprises and Nominum, Inc.
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* To learn more about Internet Systems Consortium, see
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* ``http://www.isc.org/''. To learn more about Vixie Enterprises,
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* see ``http://www.vix.com''. To learn more about Nominum, Inc., see
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* ``http://www.nominum.com''.
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*/
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#ifndef lint
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static char copyright[] =
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"$Id: raw.c,v 1.4 2005/08/11 17:13:21 drochner Exp $ Copyright (c) 2004 Internet Systems Consortium. All rights reserved.\n";
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#endif /* not lint */
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#include "dhcpd.h"
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#if defined (USE_RAW_SEND)
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#include <sys/uio.h>
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/* Generic interface registration routine... */
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void if_register_send (info)
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struct interface_info *info;
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{
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struct sockaddr_in name;
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int sock;
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struct socklist *tmp;
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int flag;
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/* Set up the address we're going to connect to. */
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memset (&name, 0, sizeof (name));
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name.sin_family = AF_INET;
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name.sin_port = local_port;
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name.sin_addr.s_addr = htonl (INADDR_BROADCAST);
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/* List addresses on which we're listening. */
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if (!quiet_interface_discovery)
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log_info ("Sending on %s, port %d",
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piaddr (info -> address), htons (local_port));
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if ((sock = socket (AF_INET, SOCK_RAW, IPPROTO_RAW)) < 0)
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log_fatal ("Can't create dhcp socket: %m");
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/* Set the BROADCAST option so that we can broadcast DHCP responses. */
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flag = 1;
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if (setsockopt (sock, SOL_SOCKET, SO_BROADCAST,
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&flag, sizeof flag) < 0)
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log_fatal ("Can't set SO_BROADCAST option on dhcp socket: %m");
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/* Set the IP_HDRINCL flag so that we can supply our own IP
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headers... */
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if (setsockopt (sock, IPPROTO_IP, IP_HDRINCL, &flag, sizeof flag) < 0)
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log_fatal ("Can't set IP_HDRINCL flag: %m");
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info -> wfdesc = sock;
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if (!quiet_interface_discovery)
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log_info ("Sending on Raw/%s%s%s",
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info -> name,
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(info -> shared_network ? "/" : ""),
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(info -> shared_network ?
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info -> shared_network -> name : ""));
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}
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void if_deregister_send (info)
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struct interface_info *info;
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{
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close (info -> wfdesc);
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info -> wfdesc = -1;
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if (!quiet_interface_discovery)
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log_info ("Disabling output on Raw/%s%s%s",
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info -> name,
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(info -> shared_network ? "/" : ""),
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(info -> shared_network ?
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info -> shared_network -> name : ""));
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}
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size_t send_packet (interface, packet, raw, len, from, to, hto)
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struct interface_info *interface;
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struct packet *packet;
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struct dhcp_packet *raw;
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size_t len;
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struct in_addr from;
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struct sockaddr_in *to;
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struct hardware *hto;
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{
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unsigned char buf [256];
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int bufp = 0;
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struct iovec iov [2];
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int result;
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/* Assemble the headers... */
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assemble_udp_ip_header (interface, buf, &bufp, from.s_addr,
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to -> sin_addr.s_addr, to -> sin_port,
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(unsigned char *)raw, len);
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/* Fire it off */
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iov [0].iov_base = (char *)buf;
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iov [0].iov_len = bufp;
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iov [1].iov_base = (char *)raw;
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iov [1].iov_len = len;
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result = writev(interface -> wfdesc, iov, 2);
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if (result < 0)
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log_error ("send_packet: %m");
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return result;
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}
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#endif /* USE_SOCKET_SEND */
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